High Performance Composites Research at NASA-Langley

Abstract

N88-I86 4 2 CCBPOSITES EIESElbCB A I RASA-LAIGLbY I(MASA) ;I p CSCL 11D Unclas G3/24 0 128900

Investigation of the viscoelastic response of high temperature AS4‐12K/RP46 composites using a micromechanical approach

“…Polymer matrix composites (PMCs) used in advanced aerospace applications, are increasingly expected to be functional within a wide range of temperatures and mechanical loadings while maintaining their other desirable properties. To meet the demand, NASA developed various types of high temperature polymers, including linear polyimides and addition aromatic polyimides . However, the first group of polyimides widely produced by NASA for use in high temperature PMC's was developed using the so‐called polymerization of monomer reactants (PMR) approach .…”

Ternary fluoro-containing polyimide blends and fluoro-containing polyimide/polyester blends

“…Fluoro-containing aromatic polyimides have received attention in the applications of electronic devices, aerospace composites and air-separation membranes. Some fluoro-containing aromatic polyimides have a superior inherent thermal stability that is one of the critical requirements for an aerospace composite matrix and electronic packaging [1][2][3][4][5][6]. Some fluoro-polyimides show much lower dielectric properties than those of conventional engineering resins [7,8]; as a result, electronic devices made from the former have lower electronic interference during the data transmission than that made from the latter.…”

“…A variety of these polymers have been synthesized by NASA and others as matrices for carbon fiber composites [1][2][3][4][11][12]. Blending these highperformance polyimides with other imides or conventional polymers also has received attention.…”